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US4841922A
Expired / Lapsed
US
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Method of making a rocker arm
Assignee: Niterra Co Ltd
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Filing: 1988-11-17
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Granted: 1989-06-27
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Expires: 2008-11-17
Abstract
Abstract A rocker arm comprises an arm section extending throughout the overall length thereof. The arm section is made of ceramics and adapted to engage a cam, valve stem and a lash adjuster.
Inventors
- 👤 Masato Taniguchi
- 👤 Mitsuyoshi Kawamura
- 👤 Noboru Ishida
- 👤 Masaya Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:23
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/12; F01L1/18; F01L2301/00; F01L2301/02; F02; F02B; F02B1/00; F02B1/02; F02B1/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49481; Y10T29/49492; Y10T29/49496; Y10T29/49499; Y10T74/00; Y10T74/20; Y10T74/20576; Y10T74/20882
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
84 words
A method of producing a rocker arm, comprising: forming a rocker arm having a valve contacting portion, a cam contacting portion and a pivot portion for contact with a pivot of a lash adjuster and entirely made of ceramics; processing said rocker arm by barrel finishing; and; grinding said pivot portion by using said valve contacting portion and said cam contacting portion as datum surfaces and thereby locating said pivot portion in position relative to said valve contacting portion and said cam contacting portion.
Claim 2
Independent Claim
84 words
A method of producing a rocker arm, comprising: forming a rocker arm having a valve contacting portion, a cam contacting portion and a pivot portion for contact with a pivot of a lash adjuster and entirely made of ceramics; processing said rocker arm by barrel finishing; and; grinding said pivot portion by using said valve contacting portion and said cam contacting portion as datum surfaces and thereby locating said pivot portion in position relative to said valve contacting portion and said cam contacting portion.
Claim 3
Independent Claim
125 words
A method of producing an all ceramic rocker arm having a valve contacting portion at an end, a pivot portion for contact with a pivot of a lash adjuster at the other end and a cam contacting portion between the pivot portion and the valve contacting portion, the valve contacting portion and the pivot portion being located on the same side and the cam contacting portion being located on the opposite side, said method comprising: forming said rocker arm; processing said rocker arm by barrel finishing; and grinding said pivot portion by using said valve contacting portion and said cam contacting portion as reference surfaces and thereby positioning said pivot portion accurately in place relative to said valve contacting portion and said cam contacting portion.
Claim 4
Independent Claim
125 words
A method of producing an all ceramic rocker arm having a valve contacting portion at an end, a pivot portion for contact with a pivot of a lash adjuster at the other end and a cam contacting portion between the pivot portion and the valve contacting portion, the valve contacting portion and the pivot portion being located on the same side and the cam contacting portion being located on the opposite side, said method comprising: forming said rocker arm; processing said rocker arm by barrel finishing; and grinding said pivot portion by using said valve contacting portion and said cam contacting portion as reference surfaces and thereby positioning said pivot portion accurately in place relative to said valve contacting portion and said cam contacting portion.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |